EKG sinus tachycardia is defined as a heart rate of >100 beats/minute and the electrical impulse comes from the sinus node, which can be seen in normal conditions, pathological conditions. 1. Normal conditions: such as exercise, stress, alcohol, coffee, etc., these conditions can make the heart excitability increase, beat faster. 2. Pathological conditions: can be seen in anemia, heart failure, etc., resulting in the heart is in a state of ischemia and hypoxia, in order to maintain normal physiological function, blood supply to the tissues and organs of the oxygen supply, the heart compensatory increase in order to increase the amount of cardiac blood transfusion, to meet the needs of the body. If sinus tachycardia is present in ECG, it is recommended to go to the cardiology department of regular hospitals for comprehensive judgment of the cause of the disease combined with medical history, symptoms, and examination and treatment, so as not to delay the condition.